/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.goxplanet;

import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;

import java.time.Duration;
import java.util.Arrays;
import java.util.Collection;

public class DataStreamJob {

	public static void main(String[] args) throws Exception {
		final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setParallelism(3);

		DataStream<SensorReading> sensorData = env
				.addSource(new SensorSource())
				.name("temperatures")
				.assignTimestampsAndWatermarks(
					WatermarkStrategy
							.<SensorReading>forBoundedOutOfOrderness(Duration.ofSeconds(5))
							.withTimestampAssigner((event, timestamp) -> event.timestamp))
				;

		DataStream<SensorReading> avgTemp = sensorData
				.map( r -> new SensorReading(r.id, r.timestamp, (r.temperature - 32) * (5.0 / 9.0)))
//				.filter(r -> r.temperature > 20)
				.keyBy(r -> r.id)
				.reduce(new ReduceFunction<SensorReading>() {
					@Override
					public SensorReading reduce(SensorReading sensorReading, SensorReading t1) throws Exception {
						return new SensorReading("1",0,0);
					}
				})


//				.window(TumblingEventTimeWindows.of(Time.seconds(5)))
//				.apply(new TemperatureAverager())
				;
		avgTemp.print();

		env.execute("Flink Java API Skeleton");
	}
}
